NORD Drivesystems BU0100 - Manual (Page 5)

NORDAC SK 140E
BU 0100 GB Technical Modifications Reserved 5
2 Electronic Motor Starter SK 140E
2.1 Principle of function
The SK 140E enables a simple motor startup in one
direction. The switching process takes place through 2
wear-free power switches. The activation or release of the
drive occurs through a 24 VDC control signal. The
integrated temperature monitoring can be done via a
temperature probe or control. A design with a rectifier -
integrated or separately installed in the terminal box – is
available for the control of a brake.
Features:
• The SK 140E contains an electronic power switch that switches the supply voltage to the motor
windings via a 24 VDC control signal [RUN].
• At the same time, the electromechanical brake (if present) is released through the integrated brake
rectifier (option).
• If the control signal is canceled, the supply of the motor windings is interrupted and the brake (if
present) is applied again.
• During the entire operation, the motor can be thermally monitored through temperature probes acting
as overload cutout. There are 2 monitoring modes that can be selected by means of a slide switch.
During automatic operation (slide switch set to [ON], the SK 140E switches the motor off automatically
and reports the excess temperature by removing the OK message (fault signal, signal [OK] changes to
low). If the automatic operation has not been selected (slide switch set to [OFF]), then only the OK
message is removed and the drive continues to run. The inputs must be connected with a jumper if
temperature monitoring is not desired.
• In automatic operation, the motor does not automatically start even after cooling. To restart, the
control signal [RUN] must first be switched off and then on again. Alternatively, the internal slide switch
can be switched [OFF] and [ON] again. Caution, the drive starts immediately!
• The
basic direction is predetermined by the system input phases. This can be altered by exchanging
2 phases. For the correct phase sequence, [RUN] corresponds to a clockwise motor direction.
• The
current status of the SK 140E is shown through 2 LEDs. These are visible from the outside
through a transparent screw plug.
SK 140E